Byung-ho Park was the KBO MVP in 2012 and 2013 after struggling in his first four seasons as a pro.

In the 2004 World Junior Championship, Park went 5 for 21 with 4 walks, a double, triple, four runs and four RBI as South Korea's starting first baseman as they beat the US for the Bronze Medal. The LG Twins took him in the first round of the 2005 draft. He made his debut with LG in 2005, hitting .190/~.246/.313 in 79 games. He was even worse in 2006 at .161/~.262/.292 in 48 contests. He spent 2007-2008 in the South Korean military. Returning to action in 2009, he hit .218/~.293/.399 with nine homers in 188 at-bats but slumped to .188/~.301/.344 in 78 contests in 2010. In 2011, he was traded with Soo-chang Shim to the Nexen Heroes for Seong-hyun Kim and Shin-young Song. He improved to .254/~.339/.522 with 13 homers in 66 games.

Park then exploded in 2012, producing at a .290/.393/.561 clip with 34 doubles, 31 home runs, 105 RBI and 20 steals. He was 7th in the league in runs (76), tied Yong-taik Park for the lead in doubles, led in home runs (5 ahead of runner-up Jung Choi), led in total bases (263, 8 ahead of Choi), led in RBI (14 ahead of Seok-min Park), led in slugging (.001 ahead of Jung-ho Kang) and was 4th in OPS (behind Tae-kyun Kim, Jung-ho Kang and Seok-min Park). He was named KBO MVP for his efforts.

He was left off South Korea's squad for the 2013 World Baseball Classic in favor of Seung-yeop Lee, Dae-ho Lee and Tae-kyun Kim but Park remained superb in 2013. He hit .318/.437/.602 with 37 home runs, 91 runs and 117 RBI. He led the KBO in homers (8 over Hyung-woo Choi), total bases (271, tied with Choi), RBI (19 over Hyung-woo Choi), runs (8 ahead of Ah-seop Son), slugging (51 points ahead of Jung Choi) and OPS (59 points ahead of Jung Choi). He was 8th in average (between Seok-min Park and Jung Choi) and 2nd to Tae-kyun Kim in OBP (.007 behind). He repeated as MVP, the 4th repeat winner in KBO annals following Dong-yol Son (1989-1990), Jong-hun Jang (1991-1992) and Seung-yeop Lee (2001-2003). He beat out Byung-kyu Lee and Young-soo Bae.